Unit 4: Sensation and Perception Flashcards
What form does Light take?
Waves.
Frequency
The distance between each hill found in Light Waves.
Amplitude
The height of each hill found in Light Waves.
Cornea
The clear curved structure that light must pass through first.
Pupil
The opening in the center of the
iris through which light enters the eye.
Lens
The transparent eye structure that focuses light rays falling on the retina.
Iris
The muscle that controls the opening of the Pupil.
Retina
Neural tissue lining the inside back surface of the eye; it absorbs light, processes images, and send visual information to the brain.
Cones
Specialized visual receptors that play a key role in daylight vision and color vision.
Fovea
The area at the center of
retina that is predominately cones.
Rods
Specialized visual receptors that play a key role in night vision and peripheral vision.
Optic Disc
A hole in the retina where the optic nerve fibers exit the eye to the brain. “The Blind Spot.”
Dark Adaptation
The process in which the eyes become more sensitive to light in low illumination.
Light Adaptation
The process of eyes becoming less sensitive to light in high illumination.
Receptive Fields
The area of space in which a receptor can respond to a stimulus.
Lateral Antagonism
Occurs when neural activity in a cell opposes activity surrounding cells.
Optic Chiasm
Optic nerves from the inside half of each eye cross over and then to the opposite half of brain.
Superior Colliculus
Coordination of visual input with other sensory input.
Feature Detectors
Neurons that respond selectively to very specific features of more complex stimuli.
Parallel Processing
The processing of many aspects simultaneously.
What Pathway
(Temporal area) Helps with recognition of objects like faces (ex. visual agnosia).
Where Pathway
(Parietal area) Where objects are located (ex. visual neglect).
Lateral Geniculate Nucleus (LGN)
A part of the thalamus in the brain that acts as a relay station, receiving visual information from the retina and transmitting it to the primary visual cortex for processing.
Ganglion Cells
Specialized neurons located in the retina at the back of the eye. They receive signals from Bipolar Cells.